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arXiv 1302.0052hep-phhep-ex
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在QCD上用$T$宇称精确预言最小Higgs模型中$W_HZ_H$的产生

Precise QCD predictions on $W_HZ_H$ production in the littlest Higgs Model with $T$ parity at the LHC

Liu Wen, Zhang Ren-You, Guo Lei, Ma Wen-Gan, Chen Liang-Wen

摘要:

研究了在CERN大型强子对撞机(LHC)上,$T$宇称达到QCD次主导阶(NLO)的最小Higgs模型对$W_H^{\pm} Z_H$产生的影响,讨论了末态衰变产物的运动学分布以及衰变截面与因子化/重整化标度的理论关系.我们发现,在$μ_F=μ_R$情况下,QCD非线性光学修正降低了首阶截面的标度不确定性。采用PROSPINO减方案(方案(II))分析QCD非线性光学贡献,得到了保持微扰QCD描述收敛性的数值结果。我们在$14 {\rm TeV}$上采用方案(II)的结果($8 {\rm TeV}$)LHC表明,$W_H^+ Z_H$产生的$K$因子在$1.01 \sim 1.10$范围内变化($1.00 \sim 1.08$),而$W_H^- Z_H$生产的$K$因子在$1.11 \sim 1.13$范围内变化($1.11 \sim 1.12$),当全局对称破缺标度$f$从$400 {\rm GeV}$变为$1.5 {\rm TeV}$时($1 {\rm TeV}$).

英文摘要:

We investigate the effects of the littlest Higgs model with $T$ parity up to the QCD next-to-leading order (NLO) on the $W_H^{\pm} Z_H$ productions at the CERN Large Hadron Collider (LHC), and discuss the kinematic distributions of final decay products and the theoretical dependence of the cross section on the factorization/renormalization scale. We find the QCD NLO corrections reduce the scale uncertainty of the leading order cross section in case of $μ_F=μ_R$. By adopting the PROSPINO subtraction scheme (scheme (II)) in analysing the QCD NLO contributions, we can obtain the numerical results which keep the convergence of the perturbative QCD description. Our results by adopting scheme (II) at the $14 {\rm TeV}$ ($8 {\rm TeV}$) LHC show that the $K$-factor for the $W_H^+ Z_H$ production varies in the range of $1.01 \sim 1.10$ ($1.00 \sim 1.08$), while the $K$-factor for the $W_H^- Z_H$ production varies in the range of $1.11 \sim 1.13$ ($1.11 \sim 1.12$), when the global symmetry breaking scale $f$ goes from $400 {\rm GeV}$ to $1.5 {\rm TeV}$ ($1 {\rm TeV}$).

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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